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Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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Items 17-32 of 746

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  1. Stern Defense SD BU9 Echo 9mm Bolt Carrier Group For Glock/Colt - NiB
    Stern Defense SD BU9 Echo 9mm Bolt Carrier Group For Glock/Colt - NiB
    $169.99
    Out of stock
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  2. Armaspec Gun Builder's Lower Parts Kit - Black
    Armaspec Gun Builder's Lower Parts Kit - Black
    $67.49
    Out of stock
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  3. Battle Arms Development 3 Piece Enhanced Lower Parts Kit
    Battle Arms Development 3 Piece Enhanced Lower Parts Kit
    $33.00
    Out of stock
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  4. Battle Arms Development Magazine Release Kit - EMR
    Battle Arms Development Magazine Release Kit - EMR
    $15.95
    Out of stock
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  5. Battle Arms Development Magazine Release Kit - EMMR
    Battle Arms Development Magazine Release Kit - EMMR
    $29.95
    Out of stock
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  6. KNS Precision AR15-MCX Stock Adapter
    KNS Precision AR15-MCX Stock Adapter
    $51.00
    Out of stock
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  7. ALG Defense Quality Mil-Spec Trigger - QMS
    ALG Defense Quality Mil-Spec Trigger - QMS
    $68.25
    Out of stock
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  8. Noveske Afghan 5.56MM Barrel - 14.5
    Noveske Afghan 5.56MM Barrel - 14.5
    $408.50
    Out of stock
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  9. Noveske Recon Stainless Lo-Pro Gas Block Barrel 5.56 - 16"
    Noveske Recon Stainless Lo-Pro Gas Block Barrel 5.56 - 16"
    $418.00
    Out of stock
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  10. Bravo Company MFG (BCM) Lower Group No Stock AR15
    Bravo Company MFG (BCM) Lower Group No Stock AR15
    $349.99
    Out of stock
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  11. Noveske N4 Light 5.56MM Barrel - 10.5 LP
    Noveske N4 Light 5.56MM Barrel - 10.5 LP
    $450.00
    Out of stock
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  12. Sharps Bros Livewire AR-15 Complete Lower Receiver w/o Stock
    Sharps Bros Livewire AR-15 Complete Lower Receiver w/o Stock
    Special Price $219.99 Regular Price $269.95
    Out of stock
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  13. Rainier Arms UltraMatch MOD3 .308 Billet Receiver Set - QD
    Rainier Arms UltraMatch MOD3 .308 Billet Receiver Set - QD
    $574.95
    Out of stock
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  14. Stern Defense AR 9mm MOD4 MLOK Complete Upper - 4"
    Stern Defense AR 9mm MOD4 MLOK Complete Upper - 4"
    $419.27
    Out of stock
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  15. Tactical Kinetics 6.5 Creedmoor Barrel - 20"
    Tactical Kinetics 6.5 Creedmoor Barrel - 20"
    $167.00
    Out of stock
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  16. Precision Armament Hypertap .223/5.56 Muzzle Brake
    Precision Armament Hypertap .223/5.56 Muzzle Brake
    Out of stock
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Items 17-32 of 746

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Barrel Length
  1. 3.66" 1 item
  2. 4" 1 item
  3. 5.5" 5 items
  4. 6" 2 items
  5. 6.5" 1 item
  6. 7" 1 item
  7. 7.5" 1 item
  8. 7.94" 1 item
  9. 8" 5 items
  10. 8.3" 3 items
  11. 8.5" 7 items
  12. 9" 4 items
  13. 9.5" 1 item
  14. 9.75" 1 item
  15. 10.3" 3 items
  16. 10.5" 9 items
  17. 11" 1 item
  18. 11.5" 7 items
  19. 12" 3 items
  20. 12.5" 5 items
  21. 13.7" 2 items
  22. 13.9" 2 items
  23. 14.5" 11 items
  24. 16" 35 items
  25. 16.1" 1 item
  26. 16.3" 1 item
  27. 18" 17 items
  28. 20" 12 items
  29. 22" 11 items
Barrel Profile
  1. Full-fluted 2 items
  2. Non-fluted 2 items
Caliber
  1. .22 ARC 2 items
  2. .22 LR 1 item
  3. .223/5.56 5 items
  4. .223 Wylde 7 items
  5. .30-30 1 item
  6. .30 Cal 5 items
  7. .308 4 items
  8. .308 Win 5 items
  9. .338 1 item
  10. .357 Magnum 2 items
  11. .38/.357 Magnum 1 item
  12. .44/.45 2 items
  13. .45-70 GOVT 2 items
  14. .45 ACP 1 item
  15. .458 Socom 2 items
  16. 300 Blackout 23 items
  17. 5.56X45 4 items
  18. 5.56 NATO 57 items
  19. 5.56mm 3 items
  20. 6mm ARC 3 items
  21. 6.5 Creedmoor 6 items
  22. 6.5 Grendel 3 items
  23. 6MM Creedmoor 6 items
  24. 7.62mm 3 items
  25. 7.62x39 3 items
  26. 7.62x51 3 items
  27. 8.6 Blackout 1 item
  28. 9mm 28 items
Category
  1. Receiver Parts 169 items
  2. Parts & Kits 75 items
  3. Barrels 14 items
  4. Rifle Barrels 68 items
  5. Buffer Systems 27 items
  6. Trigger Parts 62 items
  7. Gas Systems 22 items
  8. Muzzle Devices 67 items
  9. Bolt Parts 50 items
  10. Grips 38 items
  11. Charging Handles 23 items
  12. Rifle Handguards 77 items
  13. Stocks & Braces 50 items
  14. MILSPEC Parts 3 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 1 item
  2. AR-15 10 items
  3. Carbine 1 item
  4. Cross 1 item
  5. Curved 7 items
  6. Flaming Pig 1 item
  7. Flat 9 items
  8. Gen 1-3 1 item
  9. GEN 2 1 item
  10. Ghetto Blaster 1 item
  11. M-LOK 4 items
  12. M4 Curve 1 item
  13. Rifle 1 item
  14. Straight 1 item
  15. .625 DIA 3 items
  16. .750 DIA 18 items
  17. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Bead Blast 1 item
  3. Black 10 items
  4. Black Nitride 3 items
  5. Cerakote 5 items
  6. Chrome 1 item
  7. DLC 3 items
  8. FDE 2 items
  9. Melonite 1 item
  10. NiB-X 1 item
  11. Nickel Boron 6 items
  12. Nitride 14 items
  13. Nitromet 1 item
  14. Phosphate 3 items
  15. Polished 5 items
  16. Red 2 items
  17. Satin 7 items
  18. Anodize 27 items
  19. Clear Hard Anodize 4 items
  20. Quench Polish Quench (QPQ) 2 items
  21. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 4 items
  2. .750" 41 items
  3. .875" 5 items
Gas Length
  1. Pistol 12 items
  2. Carbine 13 items
  3. Mid 38 items
  4. Intermediate 10 items
  5. Rifle 12 items
  6. Rifle +1 2 items
  7. Rifle +2 3 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.315" 3 items
  2. 1.34" 2 items
  3. 1.42" 1 item
  4. 1.45" 1 item
  5. 1.5" 1 item
  6. 1.55" 1 item
Is Firearms?
  1. No 746 items
Manufacturer
  1. A3 Tactical 11 items
  2. Aero Precision 47 items
  3. Aeroknox 8 items
  4. Agency Arms 1 item
  5. ALG Defense 2 items
  6. Angstadt Arms 10 items
  7. Apex Tactical Specialties 1 item
  8. Armaspec 7 items
  9. Arms Republic 4 items
  10. Ascalon Arms 4 items
  11. Brügger & Thomet (B&T) 1 item
  12. B5 Systems 1 item
  13. Ballistic Advantage 24 items
  14. Battle Arms Development 35 items
  15. Blackout Defense 8 items
  16. Blitzkrieg Components 6 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 30 items
  19. Centurion Arms 9 items
  20. CMMG 1 item
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 6 items
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 3 items
  25. Drew Meyers Defense 4 items
  26. Driven Arms Co. 2 items
  27. Elftmann Tactical 1 item
  28. Ergo Grips 7 items
  29. F5 MFG 12 items
  30. Faxon Firearms 43 items
  31. Fortis MFG 10 items
  32. Forward Controls Design 9 items
  33. FosTecH 2 items
  34. Foxtrot Mike 2 items
  35. Gear Head Works 3 items
  36. Geissele 23 items
  37. Grand Power 1 item
  38. Grey Birch MFG 5 items
  39. Griffin Armament 8 items
  40. HB Industries 9 items
  41. HERA ARMS 7 items
  42. Heresy Design 1 item
  43. Hiperfire 15 items
  44. HUXWRX 5 items
  45. Icon Defense 1 item
  46. James Madison Tactical (JMT) 1 item
  47. JMAC Customs 8 items
  48. JP Enterprises Inc 14 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 13 items
  51. KNS Precision 4 items
  52. Kalashnikov USA 2 items
  53. Krebs Customs 2 items
  54. KynSHOT 2 items
  55. Lantac 16 items
  56. Law Tactical 1 item
  57. Lee Sporting 3 items
  58. Lewis Machine & Tool (LMT) 9 items
  59. Mad Pig 1 item
  60. Magpul Industries 9 items
  61. Matador Arms 1 item
  62. Maxim Defense 6 items
  63. Midwest Industries 23 items
  64. NEMO Arms 3 items
  65. Next Level Armament 5 items
  66. Noveske 30 items
  67. Obsidian Arms 1 item
  68. Patriot Ordnance Factory (POF) 1 item
  69. Precision Armament 4 items
  70. Primary Weapon Systems 9 items
  71. Q, LLC 4 items
  72. R&D Precision 1 item
  73. Radian Weapons 2 items
  74. Rainier Arms, LLC 37 items
  75. SB Tactical 5 items
  76. Seekins Precision 1 item
  77. Sharps Bros 6 items
  78. Sig Sauer 3 items
  79. Silencerco 9 items
  80. Sionics Weapon Systems 5 items
  81. SLR Rifleworks 4 items
  82. Sons of Liberty Gun Works 9 items
  83. Spinta Precision 4 items
  84. Springer Precision 1 item
  85. Stern Defense 6 items
  86. Strike Industries 1 item
  87. Surefire 8 items
  88. Taran Tactical Innovations 1 item
  89. Timney Triggers 1 item
  90. Triggertech 6 items
  91. Troy Industries 5 items
  92. TruCalibre 3 items
  93. Tyrant Designs 5 items
  94. V Seven Weapon Systems 13 items
  95. VLTOR 6 items
  96. WMD Guns 4 items
  97. WOOX 1 item
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 8 items
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Galil 1 item
  6. Remington 700 1 item
  7. Sig MCX 5 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 8 items
  2. M-LOK 63 items
  3. Picatinny 27 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 5 items
  2. AR-9 8 items
  3. AR-10 16 items
  4. AR-15 121 items
  5. Standard 3 items
  6. SRS-C 3.3 oz. 1 item
  7. SRS-H 3.8 oz. 1 item
  8. SRS-H2 4.7 oz. 1 item
  9. SRS-H3 5.6 oz. 1 item
  10. SRS-BB 5.7 oz. 1 item
  11. SRS-9mm 6.4 oz. 1 item
  12. SRS-AR10 5.7 oz. 1 item
  13. Remington 700 Short Action BDL 1 item
  14. Remington 700 Long Action BDL 1 item
  15. Sauer 100 1 item
  16. WA 1 item
  17. KS 1 item
  18. 9mm 1 item
  19. CZ 15 items
  20. FNH 1 item
  21. Glock 3 items
  22. Heckler & Koch 1 item
  23. Small Lever 1 item
  24. Large Lever 2 items
  25. AKM 1 item
  26. Adjustable 4 items
  27. Non-Adjustable 16 items
  28. MCS 2 items
  29. Full Size 2 items
  30. Dimpled 1 item
  31. Serrated 1 item
Platform
  1. 10-22 1 item
  2. AR-9 1 item
  3. AR-10 4 items
  4. AR-15 54 items
  5. AK47/74 3 items
  6. CZ-USA 8 items
  7. FNH 1 item
  8. IWI 1 item
  9. Remington 1 item
  10. Remington 700 5 items
  11. Ruger 5 items
  12. Savage Small Shank 4 items
  13. Sig Sauer 7 items
Price
  1. $0.00 - $999.99 721 items
  2. $1,000.00 - $1,999.99 24 items
  3. $2,000.00 and above 1 item
Product Type
  1. 80% Lower 2 items
  2. 10/22 Receiver 1 item
  3. Accessory 1 item
  4. Angled Grip 6 items
  5. Anti Walk Pins 3 items
  6. AR-10 Barrel 1 item
  7. AR-10 / LR 308 Charging Handle 2 items
  8. AR-10 Partial Upper Receiver 3 items
  9. AR-10 Handguard 5 items
  10. AR-10 Receiver Set 3 items
  11. AR-10 Stripped Lower Receiver 2 items
  12. AR-10 Stripped Upper Receiver 3 items
  13. AR-15 Assembled Upper Receiver 2 items
  14. AR-15 Barrel 2 items
  15. AR-15 Charging Handle 10 items
  16. AR-15 Complete Lower Receiver 19 items
  17. AR-15 Complete Upper Receiver 24 items
  18. AR-15 Partial Upper Receiver 19 items
  19. AR-15 Handguard 30 items
  20. AR-15 Receiver Set 8 items
  21. AR-15 Stripped Lower Receiver 23 items
  22. AR-15 Stripped Upper Receiver 24 items
  23. AR-9 Lower Receiver 4 items
  24. AR-9 Complete Lower Receiver 1 item
  25. AR-9 Receiver Set 1 item
  26. AR-9 Upper Receiver 7 items
  27. Barrel 67 items
  28. Blast Shield 2 items
  29. Bolt 7 items
  30. Bolt-Action Barrel 9 items
  31. Bolt Carrier Group 37 items
  32. Bolt Catch 7 items
  33. Brace 11 items
  34. Buffer 11 items
  35. Buffer Kit 6 items
  36. Buffer Spring 2 items
  37. Buffer Tube 7 items
  38. Builders Kit 1 item
  39. Cam Pin 1 item
  40. Charging Handle 8 items
  41. Chassis 8 items
  42. Compensator 6 items
  43. Complete Upper 10 items
  44. Dust Cover 2 items
  45. End Plate 3 items
  46. Firing Pin 2 items
  47. Flash Hider 16 items
  48. Forearm Accesory 5 items
  49. Forward Assist 1 item
  50. Gas Block 18 items
  51. Gas Tube 2 items
  52. Grip Accessory 1 item
  53. Grip Module 1 item
  54. Gunsmithing Tool 1 item
  55. Handguard 28 items
  56. Handstop 13 items
  57. Iron Sight 1 item
  58. Lower Parts Kit 10 items
  59. Lower Receiver 3 items
  60. Magazine Catch 2 items
  61. Magazine Release 7 items
  62. Magwell 1 item
  63. Muzzle Brake 38 items
  64. Muzzle Device Accessory 5 items
  65. Parts Kit 1 item
  66. Patch 1 item
  67. Pistol Grip 12 items
  68. Piston System 1 item
  69. Port Door 1 item
  70. Rail Adapter 2 items
  71. Rail Panel 4 items
  72. Rail Section 1 item
  73. Recoil Spring 1 item
  74. Safety Selector 19 items
  75. Scope Mount 1 item
  76. Shim Set 1 item
  77. Sight Post 4 items
  78. Silent Captured Spring 1 item
  79. Sling Mount 1 item
  80. Spring 1 item
  81. Stock 25 items
  82. Stock Accessory 5 items
  83. Stock Adapter 8 items
  84. Take Down / Pivot Pins 7 items
  85. Trigger 52 items
  86. Trigger / Hammer Pins 1 item
  87. Trigger Guard 2 items
  88. Trigger Spring 1 item
  89. Upper Parts Kit 1 item
  90. Vertical Grip 5 items
  91. Weight 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 2 items
  4. 5.5" 1 item
  5. 6.0" 2 items
  6. 6.25" 1 item
  7. 6.7" 4 items
  8. 6.91" 1 item
  9. 7" 5 items
  10. 7.25" 1 item
  11. 8" 2 items
  12. 8.25" 1 item
  13. 8.5" 1 item
  14. 9" 3 items
  15. 9.5" 6 items
  16. 9.55" 1 item
  17. 9.6" 3 items
  18. 10" 13 items
  19. 10.5" 7 items
  20. 10.7" 1 item
  21. 10.75" 1 item
  22. 11.5" 2 items
  23. 12" 14 items
  24. 12.25" 1 item
  25. 12.4" 2 items
  26. 12.5" 3 items
  27. 12.625" 1 item
  28. 12.75" 1 item
  29. 13" 8 items
  30. 13.5" 2 items
  31. 13.6" 4 items
  32. 13.625" 2 items
  33. 13.7" 4 items
  34. 13.8" 2 items
  35. 14" 2 items
  36. 15" 27 items
  37. 15.25" 1 item
  38. 15.3" 3 items
  39. 16" 1 item
  40. 16.5" 1 item
  41. 17" 1 item
  42. 18" 1 item
Size
  1. 35mm rings 3 items
  2. BACK STRAP:Large 1 item
  3. BACK STRAP:Medium 2 items
  4. 3 Slot 2 items
  5. 5 Slot 3 items
  6. 7 Slot 2 items
  7. 9 Slot 13 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1/2x28 75 items
  3. 1/2x36 1 item
  4. 5/8x24 40 items
  5. 5/8x32 1 item
  6. 11/16x24 1 item
  7. M24x1.5 RH 1 item
Threaded
  1. Yes 33 items
Twist Rate
  1. 1:5 1 item
  2. 1:7 31 items
  3. 1:7.5 5 items
  4. 1:8 11 items
  5. 1:10 11 items
Stock Status
  1. Out of stock 746 items Remove This Item
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